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<br />,J+l . eJ <br />i i <br />ht <br /> <br />Kj+1 <br />3/2 <br /> <br />(,,1+1 . t'21+1) <br />+ Kj+1 = rj+1 <br />hz 1 <br /> <br />L IKJ <br />Az L i-1/2 <br /> <br />(.1., . ,,{) <br />hz <br /> <br />. KJ <br />i+1/2 <br /> <br />, J ] <br />(,,~ . "HI) <br />hz <br /> <br />for j "" 1. 2. .... n <br /> <br />,(22) <br /> <br />,j+l ... hJ+' <br />., <br /> <br />for j '" n. n+l. <br /> <br />,(23) <br /> <br />(rJ . KJ <br />+ 'i-I 12 H'/2 <br />hz <br /> <br />for i = 2, 3. 4, <br />andj = 1. 2. 3. <br /> <br />,(20) <br /> <br />en = B <br />1 s <br /> <br />, (24) <br /> <br />oi'" 00 for i = 1. 2. 3. ... <br /> <br />, . . (21) <br /> <br />respectively. In Eq, 20, KLI2 and Ki+ I 12. are the <br />hydraulic conductivities at time level J for those <br />points halfway between grid points (i - 1) and i and <br /> <br />z <br /> <br /> ~ N M '<I' U) <br /> " " " " " <br />i= 1 .~ .~ .~ '~ '~ <br /> ~t 2 3 4 <br /> ~t ~t <br /> ~z <br />i=2 (i-l j) <br /> 1 <br /> ~t <br /> ~z <br /> <br />t <br /> <br />(i j) <br /> <br />(i j+ 1) <br /> <br />i=3 <br /> <br />~z <br /> <br />i=4 <br /> <br />(i+1 j) <br /> <br />~ z <br /> <br />i=5 <br /> <br />~ z <br /> <br />i=6 <br /> <br />Figure 2, An explicit fmite-difference scheme for semi.specifled grid intervals on the z, t-plane, <br /> <br />19 <br />